Ripple marks

(Geol.)

a system of parallel ridges on sand, produced by wind, by the current of a steam, or by the agitation of wind waves; also (Geol.), a system of parallel ridges on the surface of a sandstone stratum.

Ripple Marks

traces of the motion of water or air currents on the surface of soft coastal sediments of various bodies of water (water ripples) or on an open sand surface (wind ripples). In ancient layers, ripple marks are found on the surfaces of layers of sedimentary rock.

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